2105621 has 8 divisors (see below), whose sum is σ = 2418624. Its totient is φ = 1795680.

The previous prime is 2105611. The next prime is 2105641. The reversal of 2105621 is 1265012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2105621 - 2⁶ = 2105557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2105621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 986 + ... + 2276.

It is an arithmetic number, because the mean of its divisors is an integer number (302328).

2^2105621 is an apocalyptic number.

It is an amenable number.

2105621 is a deficient number, since it is larger than the sum of its proper divisors (313003).

2105621 is a wasteful number, since it uses less digits than its factorization.

2105621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2105621 is about 1451.0758078061. The cubic root of 2105621 is about 128.1720708271.

The spelling of 2105621 in words is "two million, one hundred five thousand, six hundred twenty-one".